Chemical synthesis and optical, structural, and surface characterization of InP-In2O3 quantum dots
| Autor: | M. L. Gómez-Herrera, M. Pérez-González, D.A. Granada-Ramírez, A.A. Durán-Ledezma, Juan Pedro Luna-Arias, P. Rodríguez-Fragoso, J.S. Arias-Cerón, J.G. Mendoza-Alvarez, J. L. Herrera-Pérez, S. A. Tomás, F. Vázquez-Hernández, Alfredo Cruz-Orea |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Photoluminescence
Materials science Absorption spectroscopy XRD Analytical chemistry General Physics and Astronomy Nanoparticle 02 engineering and technology 010402 general chemistry 01 natural sciences In2O3 Article X-ray photoelectron spectroscopy Spectrophotometry medicine XPS Spectroscopy Photoacoustic spectroscopy ComputingMethodologies_COMPUTERGRAPHICS medicine.diagnostic_test Quantum dots InP Surfaces and Interfaces General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences Surfaces Coatings and Films Quantum dot 0210 nano-technology |
| Zdroj: | Applied Surface Science |
| ISSN: | 0169-4332 |
| Popis: | Graphical abstract Highlights • InP-In2O3 QDs are synthesized by a single-step chemical method without injection of hot precursors. • HR-TEM images show the synthesis of InP and In2O3 QDs. • The InP and In2O3 QDs size increases with the P(TMS)3 concentration. • PL spectra reveal emission bands attributed to InP and In2O3 QDs. • XPS confirms the formation of InP, In2O3 and amorphous InPOx. InP-In2O3 colloidal quantum dots (QDs) synthesized by a single-step chemical method without injection of hot precursors (one-pot) were investigated. Specifically, the effect of the tris(trimethylsilyl)phosphine, P(TMS)3, precursor concentration on the QDs properties was studied to effectively control the size and shape of the samples with a minimum size dispersion. The effect of the P(TMS)3 precursor concentration on the optical, structural, chemical surface, and electronic properties of InP-In2O3 QDs is discussed. The absorption spectra of InP-In2O3 colloids, obtained by both UV–Vis spectrophotometry and photoacoustic spectroscopy, showed a red-shift in the high-energy regime as the concentration of the P(TMS)3 increased. In addition, these results were used to determine the band-gap energy of the InP-In2O3 nanoparticles, which changed between 2.0 and 2.9 eV. This was confirmed by Photoluminescence spectroscopy, where a broad-band emission displayed from 2.0 to 2.9 eV is associated with the excitonic transition of the InP and In2O3 QDs. In2O3 and InP QDs with diameters ranging approximately from 8 to 10 nm and 6 to 9 nm were respectively found by HR-TEM. The formation of the InP and In2O3 phases was confirmed by X-ray Photoelectron Spectroscopy. |
| Databáze: | OpenAIRE |
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